The PNS uses three neurotransmitters to exert its actions: ACh (released by all preganglionic neurons of the PSNS and SNS, all postganglionic neurons of the PSNS, all motor neurons of the skeletal muscles, and most postganglionic neurons of the SNS that supply the sweat glands), norepinephrine (released by nearly all postganglionic neurons of SNS with the rarity of postganglionic neurons that rese